Crash in multi-screen example when moving window

#0  0x00007ffff5d8e127 in QMetaObject::cast (this=0x7fffd47e8a28 <QWaylandQuickShellSurfaceItem::staticMetaObject>, obj=0x2) at src/corelib/kernel/qmetaobject.cpp:388
#1  0x00007fffd45279cd in QMetaObject::cast (this=0x7fffd47e8a28 <QWaylandQuickShellSurfaceItem::staticMetaObject>, obj=0x2) at /home/eskil/dev/qt5-dev/base/include/QtCore/../../src/corelib/kernel/qobjectdefs.h:233
#2  0x00007fffd46afd6c in qobject_cast<QWaylandQuickShellSurfaceItem*> (object=0x2) at /home/eskil/dev/qt5-dev/base/include/QtCore/../../src/corelib/kernel/qobject.h:442
#3  0x00007fffd46af6ed in findSurfaceItemFromMoveItem (moveItem=0x2) at src/compositor/extensions/qwaylandquickshellsurfaceitem.cpp:294
#4  0x00007fffd46ae934 in QWaylandQuickShellSurfaceItemPrivate::raise()::$_1::operator()(QQuickItem*) const (this=0x7fffffffc278, item=0x2) at src/compositor/extensions/qwaylandquickshellsurfaceitem.cpp:318
#5  0x00007fffd46ae8b7 in QWaylandQuickShellSurfaceItemPrivate::raise (this=0x5555558dff70) at src/compositor/extensions/qwaylandquickshellsurfaceitem.cpp:322
#6  0x00007fffd469f496 in QWaylandQuickItem::raise (this=0x7fffe4008b70) at src/compositor/compositor_api/qwaylandquickitem.cpp:1601
#7  0x00007fffd46b6c37 in QtWayland::XdgToplevelIntegration::handleActivatedChanged (this=0x5555558b11a0) at src/compositor/extensions/qwaylandxdgshellintegration.cpp:249
#8  0x00007fffd46b9ac4 in QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, void (QtWayland::XdgToplevelIntegration::*)()>::call(void (QtWayland::XdgToplevelIntegration::*)(), QtWayland::XdgToplevelIntegration*, void**) (
    f=(void (QtWayland::XdgToplevelIntegration::*)(QtWayland::XdgToplevelIntegration * const)) 0x7fffd46b6c00 <QtWayland::XdgToplevelIntegration::handleActivatedChanged()>, o=0x5555558b11a0, arg=0x7fffffffc620) at /home/eskil/dev/qt5-dev/base/include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:135
#9  0x00007fffd46b9a2d in QtPrivate::FunctionPointer<void (QtWayland::XdgToplevelIntegration::*)()>::call<QtPrivate::List<>, void>(void (QtWayland::XdgToplevelIntegration::*)(), QtWayland::XdgToplevelIntegration*, void**) (
    f=(void (QtWayland::XdgToplevelIntegration::*)(QtWayland::XdgToplevelIntegration * const)) 0x7fffd46b6c00 <QtWayland::XdgToplevelIntegration::handleActivatedChanged()>, o=0x5555558b11a0, arg=0x7fffffffc620) at /home/eskil/dev/qt5-dev/base/include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:172
#10 0x00007fffd46b9972 in QtPrivate::QSlotObject<void (QtWayland::XdgToplevelIntegration::*)(), QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) (which=1, this_=0x5555558cb990, r=0x5555558b11a0, a=0x7fffffffc620, ret=0x0)
    at /home/eskil/dev/qt5-dev/base/include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:383
#11 0x00007ffff5d9870e in QtPrivate::QSlotObjectBase::call (this=0x5555558cb990, r=0x5555558b11a0, a=0x7fffffffc620) at include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:363
#12 0x00007ffff5e0f863 in doActivate<false> (sender=0x5555558637b0, signal_index=14, argv=0x7fffffffc620) at src/corelib/kernel/qobject.cpp:3972
#13 0x00007ffff5e07819 in QMetaObject::activate (sender=0x5555558637b0, m=0x7fffd47e1578 <QWaylandXdgToplevel::staticMetaObject>, local_signal_index=11, argv=0x0) at src/corelib/kernel/qobject.cpp:4032
#14 0x00007fffd45c4bb5 in QWaylandXdgToplevel::activatedChanged (this=0x5555558637b0) at src/compositor/WaylandCompositor_autogen/include/moc_qwaylandxdgshell.cpp:1545
#15 0x00007fffd45c3469 in QWaylandXdgToplevelPrivate::handleAckConfigure (this=0x7fffe400a780, serial=4) at src/compositor/extensions/qwaylandxdgshell.cpp:1305
#16 0x00007fffd45c3194 in QWaylandXdgSurfacePrivate::xdg_surface_ack_configure (this=0x5555558bb160, resource=0x5555558a4d00, serial=4) at src/compositor/extensions/qwaylandxdgshell.cpp:392
#17 0x00007fffd4666929 in QtWaylandServer::xdg_surface::handle_ack_configure (client=0x555555897190, resource=0x5555558d9fc0, serial=4) at src/compositor/qwayland-server-xdg-shell.cpp:888
#18 0x00007ffff0a4ae2e in ?? () from /lib/x86_64-linux-gnu/libffi.so.8
#19 0x00007ffff0a47493 in ?? () from /lib/x86_64-linux-gnu/libffi.so.8
#20 0x00007ffff0a6a260 in ?? () from /lib/x86_64-linux-gnu/libwayland-server.so.0
#21 0x00007ffff0a6e474 in ?? () from /lib/x86_64-linux-gnu/libwayland-server.so.0
#22 0x00007ffff0a6ceea in wl_event_loop_dispatch () from /lib/x86_64-linux-gnu/libwayland-server.so.0
#23 0x00007fffd452dbeb in QWaylandCompositor::processWaylandEvents (this=0x5555556c3330) at src/compositor/compositor_api/qwaylandcompositor.cpp:835
#24 0x00007fffd452e56a in QWaylandCompositor::qt_static_metacall (_o=0x5555556c3330, _c=QMetaObject::InvokeMetaMethod, _id=13, _a=0x7fffffffd350) at src/compositor/WaylandCompositor_autogen/include/moc_qwaylandcompositor.cpp:541
#25 0x00007ffff5e0f953 in doActivate<false> (sender=0x555555882ce0, signal_index=3, argv=0x7fffffffd350) at src/corelib/kernel/qobject.cpp:3984
#26 0x00007ffff5e07819 in QMetaObject::activate (sender=0x555555882ce0, m=0x7ffff6505170 <QSocketNotifier::staticMetaObject>, local_signal_index=0, argv=0x7fffffffd350) at src/corelib/kernel/qobject.cpp:4032
#27 0x00007ffff5e3216f in QSocketNotifier::activated (this=0x555555882ce0, _t1=..., _t2=QSocketNotifier::Read, _t3=...) at src/corelib/Core_autogen/include/moc_qsocketnotifier.cpp:230
#28 0x00007ffff5e3205b in QSocketNotifier::event (this=0x555555882ce0, e=0x7fffffffd608) at src/corelib/kernel/qsocketnotifier.cpp:326
#29 0x00007ffff5d74549 in QCoreApplicationPrivate::notify_helper (receiver=0x555555882ce0, event=0x7fffffffd608) at src/corelib/kernel/qcoreapplication.cpp:1197
#30 0x00007ffff5d74020 in doNotify (receiver=0x555555882ce0, event=0x7fffffffd608) at src/corelib/kernel/qcoreapplication.cpp:1126
#31 0x00007ffff5d7412a in QCoreApplication::notify (this=0x7fffffffd9e0, receiver=0x555555882ce0, event=0x7fffffffd608) at src/corelib/kernel/qcoreapplication.cpp:1109
#32 0x00007ffff74c3764 in QGuiApplication::notify (this=0x7fffffffd9e0, object=0x555555882ce0, event=0x7fffffffd608) at src/gui/kernel/qguiapplication.cpp:1928
#33 0x00007ffff5d73f32 in QCoreApplication::notifyInternal2 (receiver=0x555555882ce0, event=0x7fffffffd608) at src/corelib/kernel/qcoreapplication.cpp:1030
#34 0x00007ffff5d74b33 in QCoreApplication::sendEvent (receiver=0x555555882ce0, event=0x7fffffffd608) at src/corelib/kernel/qcoreapplication.cpp:1448
#35 0x00007ffff61eb6c6 in socketNotifierSourceDispatch (source=0x5555555f19e0) at src/corelib/kernel/qeventdispatcher_glib.cpp:73
#36 0x00007ffff552fd1b in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#37 0x00007ffff55846f8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#38 0x00007ffff552d3c3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#39 0x00007ffff61ea7bf in QEventDispatcherGlib::processEvents (this=0x5555555f0c80, flags=...) at src/corelib/kernel/qeventdispatcher_glib.cpp:393
#40 0x00007ffff209253a in QXcbGlibEventDispatcher::processEvents (this=0x5555555f0c80, flags=...) at src/plugins/platforms/xcb/qxcbeventdispatcher.cpp:96
#41 0x00007ffff5d88696 in QEventLoop::processEvents (this=0x7fffffffd910, flags=...) at src/corelib/kernel/qeventloop.cpp:100
#42 0x00007ffff5d888c7 in QEventLoop::exec (this=0x7fffffffd910, flags=...) at src/corelib/kernel/qeventloop.cpp:182
#43 0x00007ffff5d74851 in QCoreApplication::exec () at src/corelib/kernel/qcoreapplication.cpp:1351
#44 0x00007ffff74c3536 in QGuiApplication::exec () at src/gui/kernel/qguiapplication.cpp:1860
#45 0x0000555555555321 in main (argc=1, argv=0x7fffffffdb18) at /home/eskil/dev/qt5-dev/wayland/examples/wayland/multi-screen/main.cpp:21